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What is the name of a quadrilateral in which the opposite sides are parallel and congruent?

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A square is one such quadrilateral that will fit the given description
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What is the name of a quadrilateral with both pairs of opposite sides parallel?

This is called a Parallelogram. Each pair of opposite sides will then be the same length. If all four sides are the same length, and opposite sides are parallel, then it is a

What is a quadrilateral whose opposite sides are parallel?

If only one set of opposite sides is parallel, it is a trapezoid (UK trapezium). If both pairs of opposite sides are parallel, it is a parallelogram. A parallelogram may be a

What is a quadrilateral with four right angles and opposite sides are parallel but not all sides are congruent?

This describes a rectangle. It has four sides, four right angles, and its opposite sides are parallel, but the adjacent sides are not equilateral (congruent).   If a quadri